Current Electricity 5 Question 12
12. A rigid container with thermally insulated walls contains a coil of resistance $100 \Omega$, carrying current $1 A$. Change in internal energy after $5 min$ will be
(a) zero
(b) $10 kJ$
(c) $20 kJ$
(d) $30 kJ$
$(2005,2 M)$
Objective Question II (One or more correct option)
Show Answer
Solution:
- $W=0$. Therefore, from first law of thermodynamics,
$$ \Delta U=\Delta Q=i^{2} R t=(1)^{2}(100)(5 \times 60) J=30 kJ . $$
$\therefore$ Correct answer is $(d)$.
